A California billionaire has ramped up attacks on Tesla by running a Super Bowl ad questioning the safety of the car maker's self-driving technology. The 30-second commercial shows the electric cars crashing into child-sized mannequins, driving past a stopped school bus and hitting strollers in a parking lot while a narrator proclaims that "Tesla's full self-driving is endangering the public." The ad is the latest in what has been a yearlong campaign by tech executive Dan O'Dowd to have Tesla's Full Self-Driving technology, or FSD, barred from the roads and push lawmakers to increase scrutiny of the technology's safety. Dowd founded a campaign dubbed the Dawn Project to speak out against Tesla, and bugs and security defects in other computer systems. The organization has run a full-page ad in the New York Times and posted similar videos online, but the newest video ran during one of the nation's most watched sporting events, in which a 30-second commercial was reported to cost $6 million to $7 million.